The minimum eccentricity for a column as per IS 456 is:
Choose the correct answer
emin = D/2
emin = max of (L/500 + D/30) and 20 mm
emin = 0 for perfect axial columns
emin = L/1000
Correct Answer
B. emin = max of (L/500 + D/30) and 20 mm
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IS 456 Cl. 25.4: emin = max of (L/500 + D/30) and 20 mm, where L = unsupported length, D = lateral dimension. Applied in both principal axes. Even if axial load appears concentric, emin accounts for construction imperfections. If emin > 0.05D, eccentricity must be designed for.
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